Definition: You are given a question on college chemistry. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which of the following is true for Br2 at standard temperature and pressure?
(A)It is a colorless gas. (B)It is a red-brown volatile liquid. (C)It is a colorless volatile liquid. (D)It is a yellow metallic solid.

B